If its anything like the age medical then it can be quick depending on how busy they are. You can be hanging around waiting for a particular test but for my medical I was done pretty quickly.
You fill out a few forms and they then check height, weight, eyesight, mobility, hearing and you pee in a cup to check for any nasties and a nurse will have a quick chat to discuss your medical history and whatnot and you’re generally done. If you have a ’normal’ medical history and things are running smoothly you can be in and out pretty quickly.